Question

Calculate the mass of the following:

$0.5\mathrm{mol}$ of $\mathrm{Al}$ atoms

Answer 1

• The mole formula is-
• $\mathrm{Mole}\left(\mathrm{mol}\right)=\frac{\mathrm{Mass}\left(\mathrm{g}\right)}{\mathrm{Molar}\mathrm{mass}(\mathrm{g}/\mathrm{mol})}$
• We can rearrange this formula to get the mass formula.
• $\mathrm{Mole}\left(\mathrm{mol}\right)\times \mathrm{Molar}\mathrm{mass}(\mathrm{g}/\mathrm{mol})=\mathrm{Mass}\left(\mathrm{g}\right)$
• Molar mass of $\mathrm{Al}$ - $27\mathrm{g}/\mathrm{mol}$
• Moles of $\mathrm{Al}$ - $0.5\mathrm{mol}$
• Substitute these values in the mass formula.
• $0.5\times 27=\mathrm{Mass}$
• $13.5\mathrm{g}=\mathrm{Mass}$
• Hence, 0.5 moles of $\mathrm{Al}$ atoms has 13.5g of mass.